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Posted by glen herrmannsfeldt on September 7, 2006, 2:33 pm
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> I'd be grateful if anyone could point me in the direction of any
> thorough reports on RF immunity levels expected by Performance Category
> type (5e, 6, etc) UTP (unshielded twisted pair) structured cabling.
> I've seen reference to TIA levels of 3 V/m, and reference to test
> method IEC 61000-4-3. Not sure on how folk are interpreting the
> results. Just looking at change of bit error rate? Maybe could look at
> frequency spectrum on each pair and see if levels are significant
> enough to degrade S/N.
I was about to answer, when I notice that you are from ieee, or
at least using an ieee mail account.
In a recent post here I referenced an ieee web page on alien
crosstalk in regard to FTP vs. UTP cabling. To do that test,
they actually take cables and tie them with wire ties and run
signals down them. Differential mode coupling depends not only
on the signal strength (E and B fields) but on the variation of
the fields with distance. I wouldn't expect a simple test method
to be very useful.
Many of the cable companies have web pages describing their
test methods, usually ones that show an advantage to their
product.
-- glen
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